超薄铝硅酸盐玻璃离子交换工艺与性能研究

Ion-exchange and the Effect of Processing on Properties of Ultra-thin Aluminosilicate Glass

选择纯KNO_(3)为熔盐,采用一步法和二步法对可用于手机显示屏的超薄玻璃进行离子交换强化。利用EDS对离子交换玻璃的离子浓度分布进行测试表征,研究了离子交换温度(380℃~440℃)、时间(1 h~12 h)对玻璃的离子交换深度、表面应力、显微硬度、透过率及化学稳定性的影响。结果表明:温度的升高和时间的延长有利于玻璃表面应力和显微硬度的提高,但当温度超过400℃,且时间超过2h后,玻璃出现应力松弛效应;二步法增大了离子浓度梯度,进一步提高了玻璃的表面应力和显微硬度;离子交换过程在不降低透过率的同时提高了玻璃致密度及化学稳定性。相关结论对手机显示屏领域超薄玻璃的强化具有指导意义。

Pure KNO3 was selected as the molten salt,while one-step and two-step methods were used for ion-exchange of ultra-thin aluminosilicate glass for applications in cell phone displays.The distribution of ion concentration in the ion-exchanged glass was characterized by using EDs.The effects of ion-exchange process on depth of the compressive stress layer(DOL),surface compressive stress(CS),Vickers hardness,density,transmitance and chemical stability of the glass were systematically studied.It is found that the increase in ion-exchange temperature and time as favorable to the DOL,CS and Vickers hardness.However,when the temperature exceeded 400℃ and the time exceeded 2 h,the CS and Vickers hardness decreased sharply due to the stress relaxation effect.With the two-step method,the ion concentration gradient was raised,which further improved the CS and Vickers hardness.The ion-exchange process increased density and chemical stability of the glass without reducing the transmittance.These findings are useful for the strengthening of ultra-thin glass for cell phone display applications.